Question
Positron and electron collision is a ____ collision called annihilation.
Answer
Positron and electron collision is a matter-antimatter collision called annihilation.
Example:
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Group 17: ____ are diatomic gases at room temperature.
Group 17: ____ is a diatomic liquid at room temperature.
Group 17: Bromine is a diatomic ____ at room temperature.
Group 17: ____ is a diatomic solid at room temperature.
Group 17: Iodine is a diatomic ____ at room temperature.
When in compounds, flourine always has an oxidation state of ____.